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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf378f1aa9e941daeee6767bdffbcabb40f84d5948e166992befedb0859c67ee' 
  AND token = 'z4VI/Xbe6p2MxS0EqWPgey5V9r0wARQGAzufDmXzOaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}